My brother's car has HUD and no 360 camera. Mine has the 360 camera and no HUD. We've each driven the other's car for considerable distances (like thousands of miles). I'd really miss the 360 camera if I didn't have it. The HUD is nice and I'd rather have it than not but I never felt it was even close to being a necessity.
And for me, the polarized lenses issue is substantial. I really like wearing polarized sunglasses for driving. Not only does it reduce glare from reflective surfaces, it generally enhances contrast and improves visibility. Both outside reflections and those within the car, from the windshield and dash, are greatly reduced. If a HUD were incompatible with polarized lenses, I'd continue to wear the sunglasses and just ignore the HUD. In my brother's car, there's the ability to rotate the HUD display. The images displayed don't rotate but I guess the lens they're passing through must. It enables you to optimize the image for polarization. It helps, but in my brother's car (Mazda CX-9 Signature), I still found that the display was considerably brighter and more functional if I tipped my head slightly to the side. Really annoying, actually. I found myself just ignoring it.
I think road glare can be more of a safety hazard than having to glance elsewhere for information. Research suggests that taking your eye off the road for 2 or 3 seconds isn't much of an issue. Presumably, you do it when you've already seen that the road ahead is clear and peripheral vision will alert you to a change. And most glances re probably considerably shorter than that unless you're reading information rather than just "capturing" an image. You can take in the information with a series of very brief glances rather than fixating on it for longer. It's not hard to imagine situations where it could be a problem to look away for 3 seconds, of course, but in testing the real issues start to crop up as you approach and exceed 6 seconds with eyes off the road, as when texting. I'd definitely enjoy a good HUD but, as I said, I wouldn't stop using polarized lenses to do it.
Does the Genesis system have the rotation feature? It's a good idea and would work perfectly in my brother's car if the rotation went about another 5 degrees. I also wonder if different sunglasses have slightly different polarization orientations so that trying out multiple pairs would yield one that worked. My brother has switched to nonpoalized sunglasses since getting his car wit the HUD but they don't do the same job. On a long drive, road glare is a killer and nothing eliminates it as well as polarization.